HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Physics

What is the photoelectric effect? Define stopping potential and photoelectric work function. 

The energy of a photon is 2 eV. Find its frequency and wavelength.  

The work function of a surface is 3.1 eV. A photon of frequency 1 × 10¹⁵ Hz. Is an incident on it. Calculate the incident wavelength is photoelectric emission occurs or not.   

State Einstein’s photoelectric equation. Explain all characteristics of the photoelectric effect, on the basis of Einstein’s photoelectric equation.  

With the help of a circuit diagram describe the experiment to study the characteristics of the photoelectric effect. Hence discuss any 2 characteristics of the photoelectric effect.  

Draw the circuit diagram of a half-wave rectifier. Hence explain its working. 

Draw a neat labelled circuit diagram of a full-wave rectifier using a semiconductor diode.

State the advantages of a full-wave rectifier.  

Draw the block diagram of a simple rectifier circuit with the respective output waveform. 

What is the reason for the Brownian motion?

State the laws of the simple pendulum?

Is it always necessary to use red light to get a photoelectric effect?

Eight droplets of water each of radius 0.2 mm coalesce into a single drop. Find the decrease in the surface area.

What is a rectifier?

When radiation of wavelength λ is used to illuminate a metallic surface, the stopping potential is V. When the same surface is illuminated with radiation of wavelength 3λ, the stopping potential is `"V"/4`. If the threshold wavelength for the metallic surface is nλ. then value of n will be ______.

If the maximum kinetic energy of emitted electrons in the photoelectric effect is 2eV, the stopping potential will be ______.

If friction is made zero for a road, can a vehicle move safely on this road?

Write the mathematical formula for Bohr magneton for an electron revolving in n^th orbit.

Find the magnitude of the electric field just above the middle of a large, flat, horizontal metal sheet carrying a charge density of 90 nC/m².

Find the work done when a drop of mercury of radius 2 mm breaks into 8 equal droplets. [Surface tension of mercury = 0.4855 J/m²].